Calculation on Yield Strain Depending on Time of Corrosion Influence
Antonio Shopov

Antonio Shopov, Department of Strength of Materials, Technical University Sofia, Kliment Ohridsk Blvd, Sofia, Bulgaria.
Manuscript received on 01 May 2019 | Revised Manuscript received on 15 May 2019 | Manuscript published on 30 May 2019 | PP: 2391-2396 | Volume-8 Issue-7, May 2019 | Retrieval Number: G6061058719/19©BEIESP
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Abstract: In the design of steel structures, the main value of the steel elements in the yield strain point is taken into account in the calculations. Over time, corrosion occurs on steel structures, indicating a negative influence. When a steel element is subjected to corrosion in a particular corrosion category, its mechanical properties change. Although there are many studies in the field of change, there is no uniform formula or equation that can be used to calculate the possible change in the value on yield strain. This fact prevents the preliminary assessment that can be made as regards the possibility of continued use of the corroded steel element. The processing of experimental data is a cumulative process as different data are obtained from each test. Still a non-essential single equation or formula that has sufficient practical accuracy, it is possible to determine the influence of corrosion on a steel element in a future form. There are two basic ways that can be grouped – the original state is well known, then the future state can theoretically be predicted so-called deterministic process or this is a process that is a set of random variables – a stochastic process. I conducted a survey, collected and analyzed the available database regarding the change of values in the yield strain point. I processed values using the stochastic way and the average method. From this data processing I have compiled diagrams that show the change in values over time. I used the polynomial approximation and found the equation where the values change. I have come to the conclusion that the proposed equations are sufficiently precise and can be used in practice.
Keyword: Yield Strain, Calculation, Corrosion, Influence, Time.
Scope of the Article: Materials Engineering.